Property Rich List 2015: the London street with homes worth 150 times the national average

The mega mansions and private estates dotted along London's "Billionaires Row" - the most expensive street in Britain - are worth 150 times the national average, according to Zoopla's 2015 Property Rich List.

The Sultan of Brunei and Formula One heiress Tamara Ecclestone are among the wealthy elite who count private estates in Kensington Palace Gardens as part of their global property portfolios. House prices in this W8 enclave average a staggering £42.6 million - in comparison to the current UK average of £270,511.

Zoopla's 2015 Property Rich list also reveals that the number of home owners in Britain sitting on properties worth £1 million or more has exceeded half a million for the first time. There are now 524,306 “property millionaires” in the UK, a rise of 8.3 per cent in a year.

4/15
Courtenay Avenue, N6

One of north west London's most exclusive gated private roads, leading directly to Kenwood house.

5/15
Ilchester Place, W14

Average property value: £13,718,746
Annual increase: 2.53%

Located at the southern end of Holland Park, Ilchester Place is the highly sought after residential street on the doorstep of Kensington High Street.

6/15
Compton Avenue, London N6

Average property value: £12,049,363
Annual increase: 4.20%

One of Islington's most desirable areas, Compton Avenue is close to Upper Street - one of London's most popular streets for dining out and socialising.

Image: Rex

7/15
Manresa Road, SW3

Average property value: £11,600,920
Annual increase: -5.88%

A quiet, well-known tree-lined street with a friendly village atmosphere and easy access to the sophisticated shopping of King's Road.

8/15
Grosvenor Gardens, London SW1W

Average property value: £11,321,413
Annual increase: -4.12%

Grosvenor Gardens is located close to Victoria Tube Station and is not widely considered to be once of London's best addresses - but a whole side of the street has been sold to be redeveloped as a hotel.

Image: Rex

9/15
Cottesmore Gardens, W8

Average property value: £11,037,133
Annual increase: -0.45%

A quiet street in West London, Cottesmere Gardens offers a private school and gentry and diplomats as neighbours.

10/15
Frognal Way, NW3

Average property value: £10,702,421
Annual increase: 5.42%

Located at the heart of Hampstead Village, the houses in Frognal Way were largely built between 1924 and 1939, in styles ranging from neo-Georgian to South African Dutch, when the area became a magnet for architects and artists.

11/15
For sale: homes on Britain's most exclusive streets

£29.5 million

Ilchester Place, W14: This five-bedroom house features a 16m indoor swimming pool, games room, spa area, gym and wine cellar. All bedrooms have en-suite bathrooms, and the master suite, which encompasses the entire first floor, has a terrace overlooking the landscaped south-facing garden.

12/15
For sale: homes on Britain's most exclusive streets

£20 million

Courtenay Avenue, N6: With en-suites in all seven bedrooms of this modern property, the master suite also has his-and-hers dressing and bathing areas. The leisure facilities include an indoor swimming pool, sauna and steam room, as well as a gym and club room.

13/15
For sale: homes on Britain's most exclusive streets

£10.75 million

Courtenay Avenue, N6: Approached via a sweeping carriage driveway, this six-bedroom home is entered through the Doric columned doorway, which leads into a galleried double-height hall. The property also benefits from an extensive mature garden and planning permission for an additional four-floor residence.

14/15
For sale: homes on Britain's most exclusive streets

£18 million

Grosvenor Crescent, SW1X: Arranged laterally across three townhouses, this three-bedroom apartment is located off Belgravia Square and overlooks the elegant Belgravia Crescent.

15/15
For sale: homes on Britain's most exclusive streets

£1.495 million

Compton Avenue, N1: This three-bedroom contemporary house has a private terrace and balcony, as well as luxury fittings throughout, such as a marble bathroom and feature staircase.

Almost half of the 10,958 streets in Britain where property prices average over £1 million are located in London, and all 13 streets where the average house price is over £10 million are in the capital. READ MORE: Property Rich List 2015: Britain's top 10 most expensive towns
Yet an overall slowdown is continuing to affect house price growth across London's prime property market, with values in six of the top 10 most expensive streets showing negative growth - a stark contrast to the 12.9 per cent boost to property values recorded last year.

Andy Buchanan, director of estate agent John D Wood & Co, suggests that the best houses are often not brought to the market during challenging periods, while sales of second-class houses indicate a reduction in values that is not truly reflective of the market.

For example, Grosvenor Gardens has not previously ranked as one of London's best addresses, but a whole side of the street has been sold to be redeveloped as a hotel - which is almost certainly why it has made it to this year's list. Meanwhile, the more esteemed Carlyle Square in SW3 and Montrose Place, SW1, have dropped out of the top 10 table.READ MORE: Property Rich List 2015: Britain's most expensive postcodes
Lawrence Hall of Zoopla attributes the fall in prime property values to widespread uncertainty surrounding the mansion tax proposals, which caused temporary stagnation at the top end of the market.

"This pre-election insecurity also plagued other pockets of the property market and it's likely that with the election now concluded, activity levels will increase," he says.

"In 2014, we saw average house prices plateau [in the second half of the year] after a strong start, but this time around we could well see the reverse of that and the year finishing more strongly than it began.”